Your company is expanding its IT infrastructure to adopt a multi-cloud strategy, utilizing services from multiple cloud providers to host applications and store data. This strategy aims to enhance flexibility and avoid vendor lock-in. However, the security team is concerned about maintaining a consistent security posture across all cloud environments. As the Cybersecurity Architect, you are tasked with ensuring the security of the multi-cloud environment. Which of the following approaches BEST addresses the security concerns by specifying comprehensive security requirements, including secure communication, access control, and consistent security policies across all cloud providers, while also considering cost-effectiveness and scalability? (Choose one)